I just did remove Fx and tried My Yahoo without any extensions and the strange tabs were then turn into arrow like objects. I have nothing as far as CSS in Yahoo or anywhere else about these arrows. I may just have to live with it as All I use Yahoo for is email.
I would say the down arrow would be a normal view,
I see them as down arrows also in ie10,
But the header shows many other listings and the down arrow is on the far right end of the header,
As long as you haven't added any add blockers....
Also try Firefox in safe mode to rule out Avast,
Cheers.
I would doubt turning off avast would make any difference,
You can't simply turn off a antivirus there are various features which do not simply turn off otherwise they would not offer a uninstall utility
Run Firefox in safe mode.
https://support.mozilla.org/en-US/questions/973792
At least I am not the only one with this.
Quote
